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Redis MCQs and Answers With Explanation: Redis is a high-performance in-memory data structure store that is popular in caching, message-broker, and database applications. It is a free and open-source NoSQL database that stores data in key-value pairs and supports a variety of data formats including strings, hashes, lists, sets, and sorted sets. This article contains a collection of Redis MCQ Questions & Answers designed to assist developers and database aficionados. Redis data structures, Redis commands, persistence, clustering, and scalability are among the subjects covered in these Redis MCQs.
Redis MCQs with Answers
Redis MCQ Questions and answers/ Redis Quiz with Explanations are useful resources for developers and database lovers who want to learn more about Redis. These Redis Multiple Choice Questions and extensive explanations will help you grasp Redis’ performance, scalability, and flexibility as an open-source NoSQL database. You can increase your skills by going through the Top 55 Redis MCQ Quiz questions provided in this post to prepare for tests and interviews.
Redis Multiple Choice Questions
| Name | Redis |
| Exam Type | MCQ (Multiple Choice Questions) |
| Category | Technical Quiz |
| Mode of Quiz | Online |
Top 55 Redis MCQ Questions & Answers | Practice Online Quiz
1. Which of the following is not a Redis data type?
a) Set
b) String
c) Float
d) List
Answer: c) Float
Explanation: Redis does not have a native data type for floating-point numbers.
2. What is Redis?
a) A database system
b) A message broker
c) A caching system
d) All of the above
Answer: d) All of the above
Explanation: Redis is a versatile in-memory data structure store that can be used as a database system, message broker, and caching system.
3. What is the maximum number of keys that Redis can store?
a) 2^32
b) 2^64
c) 2^128
d) There is no limit
Answer: d) There is no limit
Explanation: Redis can store an unlimited number of keys.
4. Which command is used to retrieve the value of a key in Redis?
a) GET
b) SET
c) INCR
d) DEL
Answer: a) GET
Explanation: The GET command is used to retrieve the value of a key in Redis.
5. Which data type in Redis is used to store unique values?
a) Hash
b) Set
c) List
d) Sorted Set
Answer: b) Set
Explanation: The Set data type in Redis is used to store unique values.
6. What is the default port number for Redis?
a) 6379
b) 8080
c) 3306
d) 5432
Answer: a) 6379
Explanation: The default port number for Redis is 6379.
7. Which command is used to remove a key in Redis?
a) DEL
b) GET
c) SET
d) INCR
Answer: a) DEL
Explanation: The DEL command is used to remove a key in Redis.
8. Which Redis data type is similar to an array?
a) Hash
b) List
c) Set
d) Sorted Set
Answer: b) List
Explanation: The List data type in Redis is similar to an array.
9. Which Redis command is used to retrieve multiple keys at once?
a) MGET
b) GET
c) SET
d) DEL
Answer: a) MGET
Explanation: The MGET command is used to retrieve multiple keys at once in Redis.
10. Which Redis command is used to increment the value of a key by 1?
a) INCR
b) DECR
c) INCRBY
d) DECRBY
Answer: a) INCR
Explanation: The INCR command is used to increment the value of a key by 1 in Redis.
11. Which Redis command is used to set the value of a key and expire it after a certain amount of time?
a) SET
b) SETEX
c) GET
d) DEL
Answer: b) SETEX
Explanation: The SETEX command is used to set the value of a key and expire it after a certain amount of time in Redis.
12. Which Redis command is used to append a value to a key’s current value?
a) APPEND
b) SET
c) INCR
d) DECR
Answer: a) APPEND
Explanation: The APPEND command is used to append a value to a key’s current value in Redis.
13. Which Redis command is used to retrieve the length of a list?
a) LLEN
b) LINDEX
c) LPUSH
d) RPUSH
Answer: a) LLEN
Explanation: The LLEN command is used to retrieve the length of a list in Redis.
14. Which Redis command is used to remove and return the first element of a list?
a) LPOP
b) RPOP
c) LINDEX
d) RINDEX
Answer: a) LPOP
Explanation: The LPOP command is used to remove and return the first element of a list in Redis.
15. Which Redis command is used to remove and return the last element of a list?
a) LPOP
b) RPOP
c) LINDEX
d) RINDEX
Answer: b) RPOP
Explanation: The RPOP command is used to remove and return the last element of a list in Redis.
16. Which Redis command is used to retrieve a range of elements from a list?
a) LRANGE
b) LINDEX
c) LPUSH
d) RPUSH
Answer: a) LRANGE
Explanation: The LRANGE command is used to retrieve a range of elements from a list in Redis.
17. Which Redis command is used to insert an element before or after another element in a list?
a) LINSERT
b) LINDEX
c) LPUSH
d) RPUSH
Answer: a) LINSERT
Explanation: The LINSERT command is used to insert an element before or after another element in a list in Redis.
18. Which Redis command is used to remove all occurrences of a value from a list?
a) LREM
b) LINDEX
c) LPUSH
d) RPUSH
Answer: a) LREM
Explanation: The LREM command is used to remove all occurrences of a value from a list in Redis.
19. Which Redis command is used to retrieve the score of a member in a sorted set?
a) ZSCORE
b) ZADD
c) ZRANGE
d) ZREVRANGE
Answer: a) ZSCORE
Explanation: The ZSCORE command is used to retrieve the score of a member in a sorted set in Redis.
20. Which Redis command is used to add a member to a sorted set with a score?
a) ZADD
b) ZSCORE
c) ZRANGE
d) ZREVRANGE
Answer: a) ZADD
Explanation: The ZADD command is used to add a member to a sorted set with a score in Redis.
21. Which Redis command is used to retrieve a range of members from a sorted set?
a) ZRANGE
b) ZREVRANGE
c) ZSCORE
d) ZADD
Answer: a) ZRANGE
Explanation: The ZRANGE command is used to retrieve a range of members from a sorted set in Redis.
22. Which Redis command is used to retrieve a range of members from a sorted set in reverse order?
a) ZRANGE
b) ZREVRANGE
c) ZSCORE
d) ZADD
Answer: b) ZREVRANGE
Explanation: The ZREVRANGE command is used to retrieve a range of members from a sorted set in reverse order in Redis.
23. Which Redis command is used to remove a member from a sorted set?
a) ZREM
b) ZADD
c) ZSCORE
d) ZRANGE
Answer: a) ZREM
Explanation: The ZREM command is used to remove a member from a sorted set in Redis.
24. Which Redis command is used to retrieve the number of elements in a sorted set?
a) ZCARD
b) ZSCORE
c) ZADD
d) ZRANGE
Answer: a) ZCARD
Explanation: The ZCARD command is used to retrieve the number of elements in a sorted set in Redis.
25. Which Redis command is used to retrieve the rank of a member in a sorted set?
a) ZRANK
b) ZSCORE
c) ZADD
d) ZRANGE
Answer: a) ZRANK
Explanation: The ZRANK command is used to retrieve the rank of a member in a sorted set in Redis.
26. Which Redis command is used to retrieve the reverse rank of a member in a sorted set?
a) ZREVRANK
b) ZSCORE
c) ZADD
d) ZRANGE
Answer: a) ZREVRANK
Explanation: The ZREVRANK command is used to retrieve the reverse rank of a member in a sorted set in Redis.
27. Which Redis command is used to retrieve the members with the highest scores in a sorted set?
a) ZREVRANGE
b) ZRANGE
c) ZSCORE
d) ZADD
Answer: a) ZREVRANGE
Explanation: The ZREVRANGE command is used to retrieve the members with the highest scores in a sorted set in Redis.
28. Which Redis command is used to retrieve the members with the lowest scores in a sorted set?
a) ZRANGE
b) ZREVRANGE
c) ZSCORE
d) ZADD
Answer: a) ZRANGE
Explanation: The ZRANGE command is used to retrieve the members with the lowest scores in a sorted set in Redis.
29. Which Redis command is used to retrieve all the members in a sorted set with scores between a minimum and maximum value?
a) ZRANGEBYSCORE
b) ZRANGE
c) ZSCORE
d) ZADD
Answer: a) ZRANGEBYSCORE
Explanation: The ZRANGEBYSCORE command is used to retrieve all the members in a sorted set with scores between a minimum and maximum value in Redis.
30. Which Redis command is used to retrieve all the members in a sorted set with scores greater than or equal to a minimum value and less than or equal to a maximum value?
a) ZRANGEBYLEX
b) ZRANGEBYSCORE
c) ZSCORE
d) ZADD
Answer: b) ZRANGEBYSCORE
Explanation: The ZRANGEBYSCORE command is used to retrieve all the members in a sorted set with scores greater than or equal to a minimum value and less than or equal to a maximum value in Redis.
31. Which Redis command is used to retrieve all the members in a sorted set with scores in a given lexicographic range?
a) ZRANGEBYLEX
b) ZRANGEBYSCORE
c) ZSCORE
d) ZADD
Answer: a) ZRANGEBYLEX
Explanation: The ZRANGEBYLEX command is used to retrieve all the members in a sorted set with scores in a given lexicographic range in Redis.
32. Which Redis command is used to retrieve the members with the highest scores in a sorted set, including their scores?
a) ZREVRANGEBYSCORE
b) ZRANGEBYSCORE
c) ZSCORE
d) ZADD
Answer: a) ZREVRANGEBYSCORE
Explanation: The ZREVRANGEBYSCORE command is used to retrieve the members with the highest scores in a sorted set, including their scores in Redis.
33. Which Redis command is used to retrieve the members with the lowest scores in a sorted set, including their scores?
a) ZRANGEBYSCORE
b) ZREVRANGEBYSCORE
c) ZSCORE
d) ZADD
Answer: a) ZRANGEBYSCORE
Explanation: The ZRANGEBYSCORE
command is used to retrieve the members with the lowest scores in a sorted set, including their scores in Redis.
34. Which Redis command is used to retrieve the union of multiple sets?
a) SUNION
b) SADD
c) SINTER
d) SDIFF
Answer: a) SUNION
Explanation: The SUNION command is used to retrieve the union of multiple sets in Redis.
35. Which Redis command is used to add one or more members to a set?
a) SADD
b) SMEMBERS
c) SREM
d) SISMEMBER
Answer: a) SADD
Explanation: The SADD command is used to add one or more members to a set in Redis.
36. Which Redis command is used to retrieve all the members of a set?
a) SMEMBERS
b) SADD
c) SREM
d) SISMEMBER
Answer: a) SMEMBERS
Explanation: The SMEMBERS command is used to retrieve all the members of a set in Redis.
37. Which Redis command is used to remove one or more members from a set?
a) SREM
b) SADD
c) SMEMBERS
d) SISMEMBER
Answer: a) SREM
Explanation: The SREM command is used to remove one or more members from a set in Redis.
38. Which Redis command is used to check if a member is a member of a set?
a) SISMEMBER
b) SADD
c) SMEMBERS
d) SREM
Answer: a) SISMEMBER
Explanation: The SISMEMBER command is used to check if a member is a member of a set in Redis.
39. Which Redis command is used to retrieve the members of a set that are also members of another set?
a) SINTER
b) SUNION
c) SADD
d) SMEMBERS
Answer: a) SINTER
Explanation: The SINTER command is used to retrieve the members of a set that are also members of another set in Redis.
40. Which Redis command is used to retrieve the difference between two sets?
a) SDIFF
b) SINTER
c) SUNION
d) SADD
Answer: a) SDIFF
Explanation: The SDIFF command is used to retrieve the difference between two sets in Redis.
41. Which Redis command is used to retrieve the number of members in a set?
a) SCARD
b) SADD
c) SMEMBERS
d) SREM
Answer: a) SCARD
Explanation: The SCARD command is used to retrieve the number of members in a set in Redis.
42. Which Redis command is used to retrieve a random member from a set?
a) SRANDMEMBER
b) SADD
c) SMEMBERS
d) SREM
Answer: a) SRANDMEMBER
Explanation: The SRANDMEMBER command is used to retrieve a random member from a set in Redis.
43. Which Redis command is used to retrieve multiple random members from a set?
a) SRANDMEMBER
b) SADD
c) SMEMBERS
d) SPOP
Answer: a) SRANDMEMBER
Explanation: The SRANDMEMBER command can be used to retrieve multiple random members from a set by specifying the count argument in Redis.
44. Which Redis command is used to move a member from one set to another?
a) SMOVE
b) SADD
c) SMEMBERS
d) SREM
Answer: a) SMOVE
Explanation: The SMOVE command is used to move a member from one set to another in Redis.
45. Which Redis command is used to add a member with a score to a sorted set?
a) ZADD
b) ZRANK
c) ZSCORE
d) ZINCRBY
Answer: a) ZADD
Explanation: The ZADD command is used to add a member with a score to a sorted set in Redis.
46. Which Redis command is used to increment the score of a member in a sorted set?
a) ZINCRBY
b) ZADD
c) ZSCORE
d) ZRANK
Answer: a) ZINCRBY
Explanation: The ZINCRBY command is used to increment the score of a member in a sorted set in Redis.
47. Which Redis command is used to retrieve all the members of a sorted set?
a) ZRANGE
b) ZADD
c) ZSCORE
d) ZRANK
Answer: a) ZRANGE
Explanation: The ZRANGE command is used to retrieve all the members of a sorted set in Redis.
48. Which Redis command is used to retrieve the members of a sorted set within a range of scores?
a) ZRANGEBYSCORE
b) ZADD
c) ZSCORE
d) ZRANK
Answer: a) ZRANGEBYSCORE
Explanation: The ZRANGEBYSCORE command is used to retrieve the members of a sorted set within a range of scores in Redis.
49. Which Redis command is used to retrieve the number of members in a sorted set?
a) ZCARD
b) ZADD
c) ZSCORE
d) ZRANK
Answer: a) ZCARD
Explanation: The ZCARD command is used to retrieve the number of members in a sorted set in Redis.
50. Which Redis command is used to retrieve the members of a sorted set in reverse order?
a) ZREVRANGE
b) ZADD
c) ZSCORE
d) ZRANK
Answer: a) ZREVRANGE
Explanation: The ZREVRANGE command is used to retrieve the members of a sorted set in reverse order in Redis.
51. Which Redis command is used to retrieve the rank of a member in a sorted set in reverse order?
a) ZREVRANK
b) ZADD
c) ZSCORE
d) ZRANK
Answer: a) ZREVRANK
Explanation: The ZREVRANK command is used to retrieve the rank of a member in a sorted set in reverse order in Redis.
52. Which Redis command is used to remove one or more members from a sorted set?
a) ZREM
b) ZADD
c) ZSCORE
d) ZRANK
Answer: a) ZREM
Explanation: The ZREM command is used to remove one or more members from a sorted set in Redis.
53. Which Redis command is used to retrieve the members of multiple sets and perform a union of those sets?
a) SUNIONSTORE
b) SADD
c) SINTERSTORE
d) SMEMBERS
Answer: a) SUNIONSTORE
Explanation: The SUNIONSTORE command is used to retrieve the members of multiple sets and perform a union of those sets in Redis.
54. Which Redis command is used to check if a member exists in a set?
a) SISMEMBER
b) SADD
c) SUNION
d) SINTER
Answer: a) SISMEMBER
Explanation: The SISMEMBER command is used to check if a member exists in a set in Redis.
55. Which Redis command is used to retrieve the members of multiple sets and perform an intersection of those sets?
a) SINTERSTORE
b) SADD
c) SUNIONSTORE
d) SMEMBERS
Answer: a) SINTERSTORE
Explanation: The SINTERSTORE command is used to retrieve the members of multiple sets and perform an intersection of those sets in Redis.
Redis is a highly adaptable and effective NoSQL database management system that is extensively used for a variety of applications, including caching, messaging, and database management. The Redis MCQs and answers in this post cover a wide range of Redis subjects, such as data structures, commands, durability, clustering, and scalability. Stay tuned to our website, FreshersNow, for further updates on technical quizzes.